Results test of Aramid inserts to reduce shear fracture in GFRP composite materials for aeronautical and naval use

The experimental force–displacement data were interpreted within the cohesive zone model framework, allowing the estimation of interlaminar shear strength, resilience energy, and post-failure toughness. The results show that aramid stitching increases the maximum interlaminar shear stress required to initiate delamination by approximately 11% to 25% compared to unstitched laminates, while significantly enhancing energy absorption, with resilience and toughness energies increasing by up to 70% and 50%, respectively, depending on stitch density.

The findings demonstrate that interlaminar aramid stitching promotes more damage-tolerant failure mechanisms and represents a practical reinforcement strategy to enhance the structural durability of composite laminates in artisanal marine applications.